Stiffness of free-standing thermal barrier coating top coats measured by bending tests

Determination of interfacial adhesion energies of thermal barrier coatings by compression test combined with a cohesive zone finite element model

“…A number of methods have been developed to measure the coating adhesion, and the most commonly used ones are tension (Chen et al, 2011;Wu et al, 2011;Zhou et al, 2002), shear or push-out (Guo et al, 2005;Kim et al, 2007b;Liang and Hutchinson, 1993;Liu et al, 2008;Xu et al, 2010), indentation (Begley et al, 2000;Drory and Hutchinson, 1996;Zheng and Zhou, 2005), peeling (Choi and Oh, 2001;Wei, 2004), bulge (Jensen, 1991;Volinsky et al, 2002;Zhou et al, 2003), and bending tests (Wang et al, 2012;Yamazaki et al, 2006;Zhao et al, 2010). However, there are some challenges associated with each of these techniques.…”

Simulation of damage and failure processes of thermal barrier coatings subjected to a uniaxial tensile load

“…For the past few years, many different types of failure modes leading to TBC spallation have been studied in laboratory experiments, and the most commonly used testing methods are tension [9][10][11] and bending tests [12,13]. These studies emphasize that the delamination failure of top coats normally results from the initiation and propagation of cracks either at the bottom of the TC layer or near the TC/BC interface, which severely limits the application of TBCs [14].…”

Fracture characteristics of freestanding 8wt% Y2O3–ZrO2 coatings by single edge notched beam and Vickers indentation tests

“…Therefore, the evolution of mechanical, physical and chemical properties of 8YSZ coatings during thermal cycling plays an important role in predicting their durability and reliability. In recent years, various experimental methods such as tension [7][8][9][10][11], indentation [12][13][14][15][16], compression [17], shear [18], double cantilever beam [19] and bending tests [20][21][22][23] have been developed to measure the fracture strength and toughness of 8YSZ coatings as well as the interface adhesion strength of a TBC system. Due to the influence of bond coat, substrate and components with complicated structures, however, it is difficult to thoroughly study the mechanical properties of deposited 8YSZ top coatings.…”